All four of them have taken time away from academia to work in policy jobs in Washington. Three out of four have written textbooks, and two of them have written more than one textbook.
他们四人都曾在华府从事过一些政策性工作，三人编写过教材用书，其中两人编写的书目还不止一本。
3
Before he was ushered off the field at half time, he held four taunting fingers in the air, reminding the Benfica supporters about FC Porto's era of domination of four straight league titles.